Answer / pradeep

There are so many testing are available to test a power transformer.
1. Turns ration testing : to ensure the no.of turns on each winding.
2. Winding resistance testing: To measure the resistance of each winding.
3. Vector group testing : To identify transformer vector group, which is very important for parallel operation.
4. Insulation resistance testing : To ensure the healthiness of transformer insulation resistance.
5. Impedance voltage testing : Important for parallel operation and loading condition assessment.
6. No load/ Short circuit testing : For the measurement of losses.
7. Partial discharge testing : To monitor the insulation imperfection/aging effect
8. Switching impulse/ lightning impulse testing : To measure the impulse withstand strength of the transformers.
9. Acoustic level measurement: To track the level of magnetic hum of the transformer.
10. Dissolved gas analysis: To identify dissolved gaseous in the transformer gases.
11. Dielectric testing : To measure break down potential of transformer oil.
And the count goes on...!!!
The type of testings carried out will vary based on the application and criticality

Answer / sudhakar g

HI,
Power transformer is used in Switchyards where it can
supply the voltage from grid to grid and the strutcure of
the transformer is Delta to Delta connection. there is no
stepup or step down in that.

I am taking Electrical desining classes in Bangalore...It
will be usefull for designing as well as site engineers
those who are intrested to go for Electrical
Engineers....we give you indepth knowledge of Load calu,
Cable sizing, Lighting cal, panels, breaker
selection,Autocad drawing....if any body intrested means
pls call to +91-7760362623 or sudhakar28485@gmail.com

Why Motors are generally supplied with 3 core cables??? why not 4C??

5 Answers  

---

How to calculate meter constant @ HT yard

5 Answers   Juniper Networks,

---

define the power factor in one word

12 Answers  

---

How induction stove works?

1 Answers  

---

Mention what are the types of semi-conductors?

0 Answers  

---

why series motor cannot be started on no-load?

6 Answers  

---

why synchronous motor has zero starting ?

8 Answers   NTPC,

---

what is the function of RMU?

4 Answers  

---

Why are short circuit ratings always 16kA,25kA,36kA and 50kA.Who has fixed these?

0 Answers  

---

what is W.T?specify the acceptable range?

0 Answers  

---

what is the difference between ac and dc?which one is more efficient?and what r their advantages

1 Answers  

---

What is the working principle of ceiling fan?

6 Answers   Indian Navy,

---